How do British call the metro?

Okay, here's a shot at making that paragraph sound a bit more like me talking about the London Underground (aka, The Tube!):

"So, what do the British call the metro? Well, they call it the Tube! And honestly, isn't that just the cutest? I mean, "metro" or "subway" are alright, I guess, but "The Tube" is just... perfect. It's way more charming, don't you think? You instantly picture those little trains rattling along in their round tunnels. It's just so British somehow, isn't it? It really nails that feeling of being down there, underground, you know? Kinda hidden away. I always think of those iconic carriages – yeah, they can be a little claustrophobic sometimes, I won't lie! – but they're also... cozy? Is that weird? Maybe it's just me! But yeah, I just love it. The Tube! It makes me smile every time I hear it."